Top similar games like Sentry System:

Idol Keeper is a 3D one-player turn based game where you have to make many strategic choices as you face demon waves, with many random events guarantying hours and hours of unique gaming time.

Galactic Garrison is a sci-fi, turn-based tower defense game where you defend your base from relentless alien waves on Mars. Deploy soldiers, build barricades, and upgrade defenses to withstand attacks. Earn powerful reward cards to gain strategic advantages and outmaneuver your enemies.

Tiny Battles is a tactical action auto-battler where battles take place automatically in the arena. Prologue is a demo version of the Tiny Battles game, where 2 of the 5 factions and 3 of the 15 enemy opponents are available to play.

Turn your armada into a rotating fortress, striking from every angle. A roguelite tower defense where spatial reads decide survival.

Red Sea is an intense Real-time Tactics game where you control a small team of vigilantes in increasingly challenging battles. It features a Scriptable Tactics system that mixes auto-battling with manual overrides and has a ton of powerful ability interactions to discover.

TD Worlds is a dynamic, highly strategical game that challenges your skill. Build an impenetrable defense and get ready to plunge into a new, unknown world to uncover its secrets. Use Twitch integration and play with your viewers.

Tau Cubis is a mazing tower defense game set in colorful sci-fi landscapes. Use your strategic skills to overcome numerous challenges and advance through the leaderboards.

Temporal Titans is a Tower-Defense game with Time Travel. Send mechs back to previous waves to prevent your defeat, and protect your salvage team from the monstrous Grell as you scavenge the ruins of a lost earth. Rewind, rethink, and reclaim the future!

You are the guardian of a cursed labyrinth and must prevent an adventurer from escaping with the help of your monsters. But the adventurer keeps trying again and again, accumulating levels and getting stronger... Survive to the highest possible level !

Co-op and Single player Tower Defense genre.

Pirate Rush is an auto-battler strategy game. Choose your crew, strengthen them, dominate the battlefield with your tactics, and clear your homeland of invaders.

Axon TD lets you expand the map boundaries themselves. A huge arsenal of towers and a wide variety of enemies clash in a battlefield that grows to your whims. Engage in single, cooperative, and roguelite gameplay.

You wake up in a gloomy room. Become the test subject of a shady software program that feeds on Tower Defense - Roguelike - Deckbuilder simulations.

Button Pop is a 3D Tower defense game fused with Button mashing chaos. Construct the deadliest defense strategies by unlocking powerful traps and turrets across a variety of terrains, while building your very own button with the rewards of your adventures!

Undead army fills the world, and we are trapped in the cave of an ancient god. Roguelike strategic defense! Use your resources wisely, lead your soldiers, and unite the survivors. Ultimately, turn your cave into a fortress capable of defeating the undead king. The fate of the world is in your hands.

A minimalist sci-fi tower defense. Buy soldiers and upgrade them, defeat waves of enemies, hold your lines.

Flaregate Network is a roguelike deckbuilder with RTS-inspired spaceship combat. Build a unique deck, then pilot it—and your fleet—to victory!

Astro Industry Wars is a lighthearted take on the RTS genre featuring distinct unit types, base building, economic production chains, and customizable unit rosters.

A game for those who played hundreds of strategy/roguelikes and want something new and wild. Build your army, explore a harsh random world, fight varied battles, die, start over, experiment, break the game, become godly and destroy everything. Be proud.

Bannerfall is a cute-looking but deeply tactical single-player roguelike RTS. Build custom squads of units, equip them with empowering banners and face sieges, skirmishes and story events as you journey through a randomly generated world each run.

Defend the evacuation of Terra on the losing side of an alien invasion. This experimental action strategy game breaks out of genre norms to provide fresh mechanics to strategic gaming.

Engineered to Purpose is a new tower defence game where you custom-design towers to defend your base, with millions of builds to explore and refine. Set in the far future, E2P's story of posthumanism, family, and change will open new worlds to explore and survive.

Card Conquest is a Tower Defense game with Deckbuilding and Roguelite elements. Combine spells, towers and units to create a deck and defeat your enemies. Spend your resources wisely and find balance between offense and defense. Gather powerful relics that will enhance your cards.

Gear up and get going! Defend your outposts from waves of alien enemies with your mech. Build and upgrade your base, protecting the extraction of the mysterious planetary system’s rich resources!

Do you like Tower Defense games with Strategy elements? Well, look no further! We've got exactly what you're looking for! Get ready to defend your settlement from enemies using a huge arsenal of towers!

Cosmic Raze is a sci-fi tower defense strategy game. Control advanced weapons, build powerful synergies, and then blast away as aliens attempt to conquer Earth. Between rounds you'll earn unique augmentations, purchase and upgrade a huge variety of weapons, and unlock powerful synergy bonuses.

Classic Warcraft III TD customs meet roguelike strategy. Summon and merge units to evolve them into legendary figures like Joan of Arc, Guan Yu, and Lovecraft—Legendary heroes from across time and space await! Prove your ultimate synergy against endless waves of enemies.

Tower Defense with resource- and base management! Waves of enemy robots with special abilities, shield and armor! Mining, refining and production for building and repairing! Environmental hazards and the best: the Orbital strike!

In Vermin Control, you will enter a thrilling sci-fi tower defense world filled with strategic combat and high tension. Operate a versatile unit capable of both melee combat and construction, deploy and manage 9 unique devices, and protect key facilities from relentless vermin assaults.

Hallway Defender is a roguelite tower defense where you defend your base from an endless wave of fellow classmates. With over 25 different towers and even more upgrades and effects there are infinite ways to set up your own defenses.

TAVU is a PvE RTS game with a tactical combat system. Build your bases and defend them against waves of enemy attacks. Upgrade your units and destroy enemy bases to gain new territories and resources.

Humans are ruining the lush world of Terra Inferno! Embody nature's wrath in this Turn-Based Tactics meets Resource Management Game, evoke natural calamities to devastate the human onslaught!

Autothysis is a first-person tower defense game where strategy meets precision. Deploy turrets, manage resources, and fight swarms of insectoid enemies. Target weak points to shatter foes while upgrading defenses to survive escalating waves. Can you withstand the oncoming horde?

The hungry Gooper swarm threatens intergalactic peace. Stop them! Build towers around planets and take control over their orbits. Spin them with all you’ve attached! Collect new towers, powers and upgrades to beat the onslaught of goopers and save the galaxy in this colorful Tower Defense Roguelite!

Play a 4x game in 40 minutes... or less! We streamlined 4x strategy down to a game that captures the fun in a manageable play time. Lead your faction against escalating enemies and expand the reach of your empire. Multiple paths to victory allows for a variety of strategies. Build your empire.

ELARIENNE is a defense game built on meticulous calculation and hardcore strategy. A single stroke of luck may shift the tide, but it is the carefully constructed strategy that ultimately decides the battle. Withstand relentless waves and protect the heart of the world of ELARIENNE.